Prehnite Ball and Quartz Crystals on Basalt Rock – NBB 184

Prehnite ball and quartz crystals on basalt rock

Measurements:  53 x 48 x 23 mm

Description:  A lovely green ball op bladed prehnite (22 x 19 mm) shares a basalt rock matrix with several clear quartz crystals.

There is a tiny bit of quartz attached to the surface of the prehnite ball. The prehnite appears to have no damage, few very small nicks to one of the quartz crystals, but some of the crystals on the edges of the specimen is damaged (visible on image bottom right).

Weight of Specimen:  55.1 g

Chemical Composition:   Ca2Al2Si3O10(OH)2    (prehnite)  
                                          SiO2  (quartz)  

Hardness on Mohs Scale:   (prehnite) 6-6.5
                                            (quartz)  7     

Location:  Brandberg, Namibia.

Specimen Code:  NBB 184

US $ 65

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